# N31MN: 2023 Gissen David RANS S21

- Status: Valid registration
- Airframe: [Gissen David RANS S21](https://openairdocs.org/model/gissen-david-rans-s21) (registry code 05641D5, 2 seats)
- Engine: [Rotax 915 series](https://openairdocs.org/engine/rotax-915-series) (registry code 55619)
- Data sheets: [TCDS E00051EN](https://openairdocs.org/tcds/E00051EN) (BRP-Rotax GmbH & Co KG) (OpenAirDocs)
- Serial number: 06210181
- Year built: 2023
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Rans Designs Inc S-21 OUTBOUND
- Airworthiness: Experimental, amateur built
- Airworthiness date: February 24, 2023
- Certificate issued: February 1, 2023
- Expires: February 28, 2030
- Mode S code: A34598
- Owner type: Co-owned
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=31MN
- Page: https://openairdocs.org/aircraft/N31MN

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. The registry lists only the engine series, so ADs for every Rotax 915 model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (Gissen David RANS S21)

None in force.

### Matched by engine (Rotax 915 series)

- [AD 2026-04-02](https://openairdocs.org/ad/2026-04-02): Turbine Engine Reduction Gear · BRP-Rotax 915 iSc2 C24 and 915 iSc3 C24. Effective Mar 19, 2026
- [AD 2025-15-03](https://openairdocs.org/ad/2025-15-03): Reciprocating Engine Oil System · BRP-Rotax 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24 and 1 more. Effective Aug 6, 2025

### Historical (superseded or no longer in force)

- [AD 2025-07-02](https://openairdocs.org/ad/2025-07-02) (historical): Reciprocating Engine Oil System · BRP-Rotax 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24 and 1 more. Effective Apr 21, 2025

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N31MN.

## NTSB investigations on N31MN not matched to an aircraft (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC79IA073](https://openairdocs.org/ntsb/ANC79IA073), Jul 25, 1979: Brittnorman BN-2A (N31MN), Tin City, AK, incident, minor damage

## FAA accident and incident reports

None matched to N31MN.

## Reports on N31MN not matched to an aircraft (1)

They name N31MN, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [Incident 19790725021989I](https://openairdocs.org/incident/19790725021989I), Jul 25, 1979: Bnorm BN2 (N31MN), Tin City, AK, Substantial damage. Landed downwind. Unable to stop on runway, ground looped airplane off side of runway.

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (1)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the engine (Rotax 915 series)

- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists 915 iSc2 C24

## Earlier aircraft with N31MN

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N31MN before.

- [Cancelled (date not recorded)](https://openairdocs.org/deregistered/N31MN-undated): Britten-Norman BN2A-26 ISLANDER, S/N 585. N-number assigned, not yet registered

## Related

- Other Gissen David RANS S21 aircraft: https://openairdocs.org/model/gissen-david-rans-s21/aircraft.md
- The Rotax 915 series engine: https://openairdocs.org/engine/rotax-915-series.md

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.